Telephone set base



FIG. 1 is a left side, top and front perspective view of a telephone set base showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a telephone set base, substantially as shown and described. 